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diff --git a/pcbnew/router/pns_meander_placer_base.h b/pcbnew/router/pns_meander_placer_base.h
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+/*
+ * KiRouter - a push-and-(sometimes-)shove PCB router
+ *
+ * Copyright (C) 2013-2015 CERN
+ * Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PNS_MEANDER_PLACER_BASE_H
+#define __PNS_MEANDER_PLACER_BASE_H
+
+#include <math/vector2d.h>
+
+#include <geometry/shape.h>
+#include <geometry/shape_line_chain.h>
+
+#include "pns_node.h"
+#include "pns_via.h"
+#include "pns_line.h"
+#include "pns_placement_algo.h"
+#include "pns_meander.h"
+
+class PNS_ROUTER;
+class PNS_SHOVE;
+class PNS_OPTIMIZER;
+class PNS_ROUTER_BASE;
+
+/**
+ * Class PNS_MEANDER_PLACER_BASE
+ *
+ * Base class for Single trace & Differenial pair meandering tools, as
+ * both of them share a lot of code.
+ */
+class PNS_MEANDER_PLACER_BASE : public PNS_PLACEMENT_ALGO
+{
+public:
+    ///> Result of the length tuning operation
+    enum TUNING_STATUS {
+        TOO_SHORT = 0,
+        TOO_LONG,
+        TUNED
+    };
+
+    PNS_MEANDER_PLACER_BASE( PNS_ROUTER* aRouter );
+    virtual ~PNS_MEANDER_PLACER_BASE();
+
+    /**
+     * Function TuningInfo()
+     *
+     * Returns a string describing the status and length of the
+     * tuned traces.
+     */
+    virtual const wxString TuningInfo() const = 0;
+
+    /**
+     * Function TuningStatus()
+     *
+     * Returns the tuning status (too short, too long, etc.)
+     * of the trace(s) being tuned.
+     */
+    virtual TUNING_STATUS TuningStatus() const = 0;
+
+    /**
+     * Function AmplitudeStep()
+     *
+     * Increases/decreases the current meandering amplitude by one step.
+     * @param aSign direction (negative = decrease, positive = increase).
+     */
+    virtual void AmplitudeStep( int aSign );
+
+    /**
+     * Function SpacingStep()
+     *
+     * Increases/decreases the current meandering spcing by one step.
+     * @param aSign direction (negative = decrease, positive = increase).
+     */
+    virtual void SpacingStep( int aSign );
+
+    /**
+     * Function MeanderSettings()
+     *
+     * Returns the current meandering configuration.
+     * @return the settings
+     */
+    virtual const PNS_MEANDER_SETTINGS& MeanderSettings() const;
+
+    /*
+     * Function UpdateSettings()
+     *
+     * Sets the current meandering configuration.
+     * @param aSettings the settings
+     */
+    virtual void UpdateSettings( const PNS_MEANDER_SETTINGS& aSettings);
+
+    /**
+     * Function CheckFit()
+     *
+     * Checks if it's ok to place the shape aShape (i.e.
+     * if it doesn't cause DRC violations or collide with
+     * other meanders).
+     * @param aShape the shape to check
+     * @return true if the shape fits
+     */
+    virtual bool CheckFit( PNS_MEANDER_SHAPE* aShape )
+    {
+        return false;
+    }
+
+protected:
+
+    /**
+     * Function cutTunedLine()
+     *
+     * Extracts the part of a track to be meandered, depending on the
+     * starting point and the cursor position.
+     * @param aOrigin the original line
+     * @param aTuneStart point where we start meandering (start click coorinates)
+     * @param aCursorPos current cursor position
+     * @param aPre part before the beginning of meanders
+     * @param aTuned part to be meandered
+     * @param aPost part after the end of meanders
+     */
+    void cutTunedLine(  const SHAPE_LINE_CHAIN& aOrigin,
+                        const VECTOR2I& aTuneStart,
+                        const VECTOR2I& aCursorPos,
+                        SHAPE_LINE_CHAIN& aPre,
+                        SHAPE_LINE_CHAIN& aTuned,
+                        SHAPE_LINE_CHAIN& aPost );
+
+    /**
+     * Function tuneLineLength()
+     *
+     * Takes a set of meanders in aTuned and tunes their length to
+     * extend the original line length by aElongation.
+     */
+    void tuneLineLength( PNS_MEANDERED_LINE& aTuned, int aElongation );
+
+    /**
+     * Function compareWithTolerance()
+     *
+     * Compares aValue against aExpected with given tolerance.
+     */
+    int compareWithTolerance ( int aValue, int aExpected, int aTolerance = 0 ) const;
+
+    ///> width of the meandered trace(s)
+    int m_currentWidth;
+    ///> meandering settings
+    PNS_MEANDER_SETTINGS m_settings;
+    ///> current end point
+    VECTOR2I m_currentEnd;
+};
+
+#endif    // __PNS_MEANDER_PLACER_BASE_H